package com.njth.filter;

import java.io.IOException;
import javax.servlet.*;

public class setCharacterEncoding implements Filter {

	public setCharacterEncoding() {
		encoding = null;
		filterConfig = null;
		ignore = true;
	}

	public void destroy() {
		encoding = null;
		filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (ignore || request.getCharacterEncoding() == null) {
			String encoding = selectEncoding(request);
			if (encoding != null)
				request.setCharacterEncoding(encoding);
		}else{
			request.setCharacterEncoding(encoding);
			response.setCharacterEncoding(encoding);
		}
		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		encoding = filterConfig.getInitParameter("encoding");
		String value = filterConfig.getInitParameter("ignore");
		if (value == null)
			ignore = true;
		else if (value.equalsIgnoreCase("true"))
			ignore = true;
		else if (value.equalsIgnoreCase("yes"))
			ignore = true;
		else
			ignore = false;
	}

	protected String selectEncoding(ServletRequest request) {
		return encoding;
	}

	protected String encoding;

	protected FilterConfig filterConfig;

	protected boolean ignore;
}
